What is the cheapest airline that flies from Portland to London Heathrow?

JetBlue, United Airlines, and American Airlines are the most popular carriers operating from Portland to London Heathrow

What airlines fly to London Heathrow Airport?

British Airways, Delta and American Airlines are the top three most popular airlines that fly to London Heathrow Airport from Portland, Maine according to our data. British Airways is the first choice among our users, with 46% of people opting to fly with this airline when traveling to London Heathrow Airport. Keep in mind that there are 17 different airlines that fly to London Heathrow Airport on a routine basis, so you have a few additional options to choose from.

When did momondo last update prices for flights from Portland Airport to London Heathrow Airport?

Prices for flights from Portland Airport to London Heathrow Airport refresh daily.

How many operators does momondo search for flights from Portland Airport to London Heathrow Airport?

There is 1 operator available for flights from Portland Airport to London Heathrow Airport as of September 2026.

How old do you have to be to fly from Portland Airport to London Heathrow Airport?

Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Portland Airport to London Heathrow Airport.

What documentation or ID do you need to fly to London Heathrow Airport?

The necessary travel and health documents for your London Heathrow Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.

$320 Cheap Flights from Portland, Maine to London Heathrow Airport in 2026

Find the cheapest flights from Portland, Maine to London

Round-trip

One-way

Last minute

Cheap round-trip flights

Enter your travel dates to find the best prices.

12:45 pm - 6:50 amPWM Portland-LHR London Heathrow

13h 05m1 stop Detroit Metropolitan Wayne County

6:30 am - 12:19 amLHR London Heathrow-PWM Portland

22h 49m2 stops Amsterdam Schiphol New York John F Kennedy Intl

$739Delta

Tue, Nov 10 - Tue, Nov 17

4:20 pm - 8:50 amPWM Portland-LHR London Heathrow

11h 30m1 stop New York John F Kennedy Intl

11:45 am - 12:10 amLHR London Heathrow-PWM Portland

17h 25m2 stops Amsterdam Schiphol New York John F Kennedy Intl

$739Delta

Mon, Oct 5 - Tue, Oct 20

6:00 am - 6:25 amPWM Portland-LHR London Heathrow

19h 25m1 stop Atlanta Hartsfield-Jackson

6:20 am - 11:31 pmLHR London Heathrow-PWM Portland

22h 11m2 stops Paris Charles de Gaulle Atlanta Hartsfield-Jackson

$739Delta

Tue, Nov 10 - Tue, Nov 17

6:00 am - 6:20 amPWM Portland-LHR London Heathrow

19h 20m1 stop New York John F Kennedy Intl

8:55 am - 12:19 amLHR London Heathrow-PWM Portland

20h 24m2 stops Paris Charles de Gaulle New York John F Kennedy Intl

$739Delta

Tue, Nov 10 - Tue, Nov 17

2:05 pm - 9:00 amPWM Portland-LHR London Heathrow

13h 55m1 stop Atlanta Hartsfield-Jackson

8:55 am - 12:19 amLHR London Heathrow-PWM Portland

20h 24m2 stops Paris Charles de Gaulle New York John F Kennedy Intl

$739Delta

Tue, Nov 10 - Tue, Nov 24

6:04 am - 6:20 amPWM Portland-LHR London Heathrow

19h 16m1 stop New York John F Kennedy Intl

11:30 am - 12:10 amLHR London Heathrow-PWM Portland

17h 40m2 stops Paris Charles de Gaulle New York John F Kennedy Intl

$739Delta

Wed, Oct 7 - Wed, Oct 14

4:03 pm - 8:35 amPWM Portland-LHR London Heathrow

11h 32m1 stop New York John F Kennedy Intl

8:55 am - 12:21 amLHR London Heathrow-PWM Portland

20h 26m2 stops Paris Charles de Gaulle New York John F Kennedy Intl

$739Delta

Tue, Nov 24 - Thu, Dec 3

4:15 pm - 10:30 amPWM Portland-LHR London Heathrow

13h 15m1 stop New York John F Kennedy Intl

11:45 am - 12:19 amLHR London Heathrow-PWM Portland

17h 34m2 stops Amsterdam Schiphol New York John F Kennedy Intl

$740Multiple Airlines

Wed, Nov 4 - Thu, Nov 12

8:49 am - 9:10 amPWM Portland-LHR London Heathrow

19h 21m1 stop Newark

6:50 am - 11:21 pmLHR London Heathrow-PWM Portland

21h 31m2 stops Brussels Bruxelles-National Newark

$745United Airlines

Mon, Nov 16 - Wed, Nov 18

4:15 pm - 8:05 amPWM Portland-LHR London Heathrow

10h 50m1 stop New York John F Kennedy Intl

4:35 pm - 12:19 amLHR London Heathrow-PWM Portland

12h 44m1 stop New York John F Kennedy Intl

$746KLM

Wed, Nov 4 - Tue, Nov 10

Cheap last minute flights

Enter your travel dates to find the best prices.

2:38 pm - 6:55 amPWM Portland-LHR London Heathrow

11h 17m1 stop Washington, D.C. Dulles Intl

6:50 am - 7:24 pmLHR London Heathrow-PWM Portland

17h 34m2 stops Brussels Bruxelles-National Washington, D.C. Dulles Intl

$1,000United Airlines

Tue, Sep 15 - Thu, Sep 17

6:00 am - 8:45 pmPWM Portland-LHR London Heathrow

9h 45m1 stop New York John F Kennedy Intl

8:15 am - 11:54 pmLHR London Heathrow-PWM Portland

20h 39m1 stop New York John F Kennedy Intl

$1,004JetBlue

Tue, Sep 15 - Thu, Sep 17

3:43 pm - 10:40 amPWM Portland-LHR London Heathrow

13h 57m2 stops Newark Washington, D.C. Dulles Intl

6:50 am - 6:29 pmLHR London Heathrow-PWM Portland

16h 39m2 stops Brussels Bruxelles-National Newark

$1,005United Airlines

Tue, Sep 15 - Thu, Sep 17

6:00 am - 9:30 amPWM Portland-LHR London Heathrow

22h 30m1 stop New York John F Kennedy Intl

8:15 am - 11:54 pmLHR London Heathrow-PWM Portland

20h 39m1 stop New York John F Kennedy Intl

$1,043JetBlue

Thu, Sep 17 - Sat, Sep 19

2:38 pm - 6:55 amPWM Portland-LHR London Heathrow

11h 17m1 stop Washington, D.C. Dulles Intl

6:50 am - 11:59 pmLHR London Heathrow-PWM Portland

22h 09m2 stops Brussels Bruxelles-National Washington, D.C. Dulles Intl

$1,100United Airlines

Thu, Sep 17 - Sat, Sep 19

6:06 am - 6:55 amPWM Portland-LHR London Heathrow

19h 49m2 stops Newark Washington, D.C. Dulles Intl

6:50 am - 11:32 pmLHR London Heathrow-PWM Portland

21h 42m2 stops Brussels Bruxelles-National Newark

$1,105United Airlines

Thu, Sep 17 - Sat, Sep 19

9:10 am - 6:30 amPWM Portland-LHR London Heathrow

16h 20m3 stops Newark Toronto Pearson Intl Ottawa

2:10 pm - 11:59 pmLHR London Heathrow-PWM Portland

14h 49m2 stops Ottawa Washington, D.C. Dulles Intl

$1,268Multiple Airlines

Thu, Sep 17 - Sat, Sep 19

9:10 am - 6:30 amPWM Portland-LHR London Heathrow

16h 20m3 stops Newark Toronto Pearson Intl Ottawa

8:30 am - 11:32 pmLHR London Heathrow-PWM Portland

20h 02m3 stops Toronto Pearson Intl Montreal Pierre Elliott Trudeau Intl Newark

$1,280Air Canada

Thu, Sep 17 - Sat, Sep 19

3:43 pm - 11:50 amPWM Portland-LHR London Heathrow

15h 07m2 stops Newark Toronto Pearson Intl

8:30 am - 11:32 pmLHR London Heathrow-PWM Portland

20h 02m3 stops Toronto Pearson Intl Montreal Pierre Elliott Trudeau Intl Newark

$2,208Multiple Airlines

Tue, Sep 15 - Thu, Sep 17

9:10 am - 6:30 amPWM Portland-LHR London Heathrow

16h 20m3 stops Newark Toronto Pearson Intl Montreal Pierre Elliott Trudeau Intl

8:30 am - 11:32 pmLHR London Heathrow-PWM Portland

20h 02m3 stops Toronto Pearson Intl Montreal Pierre Elliott Trudeau Intl Newark

$2,211Air Canada

Tue, Sep 15 - Thu, Sep 17

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Delta flights from Portland, Maine to London Heathrow Airport

Our best Delta deals on Portland, Maine to London Heathrow Airport flight tickets

Delta

Nov 10

PWM6:00 amPortland

19h 25m

1 stop

LHR6:25 amLondon Heathrow

Nov 24

LHR8:55 amLondon Heathrow

20h 24m

2 stops

PWM12:19 amPortland

$739

Delta

Nov 10

PWM4:50 pmPortland

13h 50m

2 stops

LHR11:40 amLondon Heathrow

Nov 17

LHR6:30 amLondon Heathrow

22h 49m

2 stops

PWM12:19 amPortland

$743

Delta

Oct 7

PWM4:47 pmPortland

14h 18m

2 stops

LHR12:05 pmLondon Heathrow

Oct 14

LHR8:55 amLondon Heathrow

20h 15m

2 stops

PWM12:10 amPortland

$744

KLM flights from Portland, Maine to London Heathrow Airport

Our best KLM deals on Portland, Maine to London Heathrow Airport flight tickets

KLM

Nov 5

PWM2:09 pmPortland

16h 31m

1 stop

LHR11:40 amLondon Heathrow

Nov 10

LHR11:45 amLondon Heathrow

17h 34m

2 stops

PWM12:19 amPortland

$790

KLM

Jan 15

PWM2:35 pmPortland

14h 55m

1 stop

LHR10:30 amLondon Heathrow

Mar 13

LHR9:05 amLondon Heathrow

19h 44m

1 stop

PWM11:49 pmPortland

$855

momondo Fare Finder

Use the filters below to find and compare flights from Portland, Maine to London Heathrow Airport that are best for you.

Fly from

Fly to

Route

Depart

Return

Price

Cheapest round-trip

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 11/10

12:45 pm-6:50 am

1 stop13h 05m

London Heathrow

Tue 11/17

6:30 am-12:19 am

2 stops22h 49m

$739

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 10/5

4:20 pm-8:50 am

1 stop11h 30m

London Heathrow

Tue 10/20

11:45 am-12:10 am

2 stops17h 25m

$739

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 11/10

6:00 am-6:25 am

1 stop19h 25m

London Heathrow

Tue 11/17

6:20 am-11:31 pm

2 stops22h 11m

$739

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 11/10

6:00 am-6:20 am

1 stop19h 20m

London Heathrow

Tue 11/17

8:55 am-12:19 am

2 stops20h 24m

$739

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 11/10

2:05 pm-9:00 am

1 stop13h 55m

London Heathrow

Tue 11/24

8:55 am-12:19 am

2 stops20h 24m

$739

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Wed 10/7

6:04 am-6:20 am

1 stop19h 16m

London Heathrow

Wed 10/14

11:30 am-12:10 am

2 stops17h 40m

$739

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Tue 11/24

4:03 pm-8:35 am

1 stop11h 32m

London Heathrow

Thu 12/3

8:55 am-12:21 am

2 stops20h 26m

$739

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Wed 11/4

4:15 pm-10:30 am

1 stop13h 15m

London Heathrow

Thu 11/12

11:45 am-12:19 am

2 stops17h 34m

$740

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Mon 11/16

8:49 am-9:10 am

1 stop19h 21m

London Heathrow

Wed 11/18

6:50 am-11:21 pm

2 stops21h 31m

$745

Quickest round-trip

PortlandLondon

PWM Portland - LHR London Heathrow

PWMLHR

Portland

Wed 11/4

4:15 pm-8:05 am

1 stop10h 50m

London Heathrow

Tue 11/10

4:35 pm-12:19 am

1 stop12h 44m

$746

Flights are sorted by cheapest round-trip flights first.

Showing 1-10 of 20 resultsSorted by cheapest first

How to get the cheapest flight ticket from Portland, Maine to London Heathrow Airport

Look no further. We've gone through all the searches for this route on momondo so you have the important information and insights to find the cheapest flight ticket for your trip

Prices

Airlines

What is the typical price of a round-trip flight between Portland, Maine and London Heathrow Airport?

Prices are currently low for flights on this route.

Typical prices usually range from $928 to $1,171.
The lowest price recently found on this route was $739.

What is the cheapest month to fly to London Heathrow Airport?

The month of December is, on average, the cheapest month to fly to London Heathrow Airport from Portland, Maine, with most prices found around $0. If you’re not able to fly to London Heathrow Airport in December, then January is your next best option. Flight prices from Portland, Maine to London Heathrow Airport during January average around $0.

When to book flights from Portland, Maine to London Heathrow Airport

Are you open to changing your travel dates? Check out the ideal times to fly from Portland, Maine to London Heathrow Airport according to our flight data. Find out which month and days have the cheapest flights.

Estimated round-trip price

Cheap Portland, Maine to London Heathrow Airport (PWM to LHR) flight deals and tips

Find info about flight duration, direct flights, and airports for your flight from Portland, Maine to London Heathrow Airport

Best Price Found	$320
Fastest flight time	9h 25m
Direct flights	None

The best one-way flight to London Heathrow Airport from Portland, Maine in the past 72 hours is $320. The best round-trip flight deal from Portland, Maine to London Heathrow Airport found on momondo in the last 72 hours is $739.

The fastest flight from Portland, Maine to London Heathrow Airport takes 9h 25m

There are no direct flights from Portland, Maine to London Heathrow Airport. There are no popular flight routes from Portland, Maine to London Heathrow Airport.

Search flight deals

Frequently asked questions about flying from Portland, Maine to London Heathrow Airport

How far is Portland to London Heathrow by plane?
The distance between Portland and London Heathrow is about 3170.3 mi. In terms of flight time, this usually takes a little over 9h 25m.
When did momondo last update prices for flights from Portland Airport to London Heathrow Airport?
Prices for flights from Portland Airport to London Heathrow Airport refresh daily.
How many operators does momondo search for flights from Portland Airport to London Heathrow Airport?
There is 1 operator available for flights from Portland Airport to London Heathrow Airport as of September 2026.
How old do you have to be to fly from Portland Airport to London Heathrow Airport?
Although the minimum age for a child to fly alone is five, airlines that offer an unaccompanied minor (UMNR) service may have their own age limits, which could be impacted by factors such as flight length, timing, and layovers. It is recommended that you verify with the airline you are booking with for travel from Portland Airport to London Heathrow Airport.
What documentation or ID do you need to fly to London Heathrow Airport?
The necessary travel and health documents for your London Heathrow Airport trip may vary depending on your travel plans and individual circumstances. Generally, you should have various documents, such as a national ID card or driver's license and a passport that is valid for six months beyond your scheduled arrival date. We recommend seeking advice from your airline or a trusted third party, such as IATA.
What is the most popular airline from Portland, Maine to London Heathrow Airport?
Based on momondo bookings for flights between Portland, Maine and London Heathrow Airport, the leading airline is United Airlines, making up 100% of the total bookings.

Hounslow

Gatwick

Milton Keynes

Luton

Stratford-upon-Avon

Hayes

Wembley

Dover

Croydon

Richmond

Stansted

Kingston upon Thames

Harrow

Cobham

Watford

Slough

Eastbourne

Worthing

Hook

Uxbridge

Why use momondo?

Why should I use momondo to find a flight deal from Portland to London?

To find the flight that best suits your needs, momondo gathers a range of flights from a large pool of different airlines and agents; you can then use our insights and filters to find and book the right flight to London from Portland.

Can I find flights from Portland to London with flexible booking policies on momondo?

Yes. momondo enables you to select and highlight flights to London from Portland with this policy.

How can momondo help me find flights from Portland to London?

Once you have performed a search for Portland to London flights, momondo helps you find the right one by offering useful filters to narrow down your flight selection. Flights can be filtered by multiple factors such as airline, airport and price; but also by other criteria like aircraft type and payment method.

I’m not ready to book a flight from Portland to London right now. Can momondo alert me if prices change?

If you are simply researching potential flights to London, momondo offers a useful price alert feature which will track prices for flights to London from Portland and alert you when they change.

An easier way to manage your London Heathrow Airport trip

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Flights to London Gatwick Airportfrom $380

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Flights to London City Airportfrom $580

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Flights to Belfast City Airportfrom $669

Cheap flights from Portland, Maine to London from $320

This is the cheapest one-way flight price found by a momondo user in the last 72 hours by searching for a flight from Portland, Maine to London departing on 10/14. Fares may change, and may not be available for all flights or travel dates. Click the price to refresh the search for this deal.

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Delta flights from Portland, Maine to London Heathrow Airport

Our best Delta deals on Portland, Maine to London Heathrow Airport flight tickets

KLM flights from Portland, Maine to London Heathrow Airport

Our best KLM deals on Portland, Maine to London Heathrow Airport flight tickets

momondo Fare Finder

Use the filters below to find and compare flights from Portland, Maine to London Heathrow Airport that are best for you.

See travel insights to London from

How to get the cheapest flight ticket from Portland, Maine to London Heathrow Airport

What is the typical price of a round-trip flight between Portland, Maine and London Heathrow Airport?

What is the cheapest month to fly to London Heathrow Airport?

What is the cheapest airline that flies from Portland to London Heathrow?

What airlines fly to London Heathrow Airport?

When to book flights from Portland, Maine to London Heathrow Airport

Cheap Portland, Maine to London Heathrow Airport (PWM to LHR) flight deals and tips

Best Price Found

Fastest flight time

Direct flights

Frequently asked questions about flying from Portland, Maine to London Heathrow Airport

Traveling to a place near London?

Why use momondo?

An easier way to manage your London Heathrow Airport trip

We make it super easy to schedule, organize and travel with friends or family. Trips is free — and available to use no matter where you book.

Get notified when prices go down

Daily price changes in your inbox - only with Price Alerts.

Find better results for your trip to London

Popular cities in the United Kingdom

Popular flights according to clicks in the last 7 days on momondo

Portland, Maine flight routes

According to popular flight searches on momondo this year

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List of cabin classes available on flights landing in London. Availability may vary depending on flight origin and airline.

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